Reamer-drill for well-boring.



W. M. WALKER.

BEAMER DRILL FOR WELL BORING. APPLICATION FILED FEB.'5. IsII.

wrLnrAM M. WALKER, or rRIsoo, Texas.

' BEAMER-DRILL FOR WELL-BORING.

Lerares.

Specification of Letters Patent.

Patenten sept. ie, iets.

Application filed February 5, 1917. Serial No. 146,691.

like and in such connection it relates more particularly to theconstruction and arrangementt of thel drill.

Heretofore in the drilling of wells, the drill surrounded by andin'advance of the casing of the well was usually provided with reaming'projections or arms which as 'the drill advanced in the earth or rockwould enlarge the hole sucientlyito permit the casing with its couplingsto descend in the hole, the drill itself not being adapted to drill ahole of suilicient diameter to accommodate the couplings. In suchcombined drill and reamer, a rather complicated toggle construction wasrequired to permit of the reamer arms to be drawn or folded inward topermit of the drill being drawn through the casing. l

Some attempts have also been made to form a drill which as it isprojected below the casing may expand to drill a hole and team it out tothe required diameters. Such structures-however havey not beensuccessfuly for several reasons among which are the following:

ln the drill there was no provision of a groove or. channel between thewings `or Orks of the drill proper for the purpose of permitting themud, etc., escaping upward in the casing and insuch drill there was noprovision for limiting the expansion or separation of the forks of thedrill which would occur if the drill struck rock or hard surfaces duringthe drilling operation.

My present invention contemplates the provision of a drill which mayexpand as it leaves the casing to form a drill and reamer, saidexpanding drill having between its diverging forks a groo`ve or channelinto which the mud may pass during the drilling operation and whichdrill also is provided with means for limiting the exwithpansion orseparation of the forks as the drill advances through the rock or hardstrata.

The nature and scope of my invention will be more fully understood fromthe following description taken in connection with the accompanyingdrawings forming part hereof, in which- Figure 1, is a side elevationalview of a drill and reamer embodying my invention, the surroundingcasing being shown in section, and t-he drill projecting beyond thelower end of said casing.

Fig. 2, is a vertical sectional view of the drill when drawn upwardinthe casing, the plane of said section being taken on line 2-2 of Fig.'3.

Fig. 3 is a view similar to Fig. 1 but illustrating the drill drawn upinto the casing.

Fig. 4 is an end elevational view of Fig. 3.

Fig. 5 is a cross-sectional view taken on the line 5-5, of Fig. 1, and

Fig. 6 is a cross-sectional view taken on the line 6 6 of Fig. 3.

Referring to the drawings 1 represents the casing which is in sectionsunited together by couplings 2 screwed on the eX- terior of meeting endsof sections 1. Within the'casing 1 the drill is adapted to be lowered,said drill having a screw or other connecting upper end 3 fitting into asectional drill rod not shown. l

The main body 4 of the drill is formed of tool steel or similar springmetal and its lower or drilling end is divided into two forks 5. Theseforks 5 each have a main body portion 6 which is flattened `the bodyportions of the respective forks being contiguous to and riding overeach other. The width vof each iat body portion 6 is slightly less thanthe diameter of the inclosing casj projects beyond the casing the twoforks 1 spring apart and the flat bodies 6 slide over each other to makea body which is of larger diameter than either the casing 1 or thecoupling 2 as clearly shown in Figs. 1 and 5.

Each drill fork 5 has its dat body provided at either end with a curvedcutting flange 7 and 8 respectively and fbetween these flanges a groove9 is formed into and through which the mud or earth orrock may passupward as the drill advances. This groove 9 of each fork 5y is what is etermed a mud groove and both grooves 9 terminate at their upper ends inthe recess 10 cut into the drill body 4 to form the forks 5 of thedrill. This drill body 4 is slightly flattened (see Fig. 2) on two facesto form a continuation of the space or channel through which the mudor"excavated matter may pass upward into the casing.

To prevent accidental spreading of the drill forksduring drilling theinner anges 8 will serve in a measure to hold the drill to its work. Inaddition to these flanges 8 a positive means for preventing the too wideseparation of the forks of the drill is provided. This means consistspreferably of one or more pins 11 secured to one at body 6 of the drilland working in` one or more slots 12 formedV in the other dat body 6. lthas been found that two pins and two slots arran ed as lshown in thedrawings will be pre erable in securing the two drill forks `togetheragainst too wide displacement or breakage during the drilling andreaming operation even should the drill and reamer strike solid rock orother obstruction. i

Having thus described my invention what I claim as new isr- 1. In adevice of the character described, a drill having its main body recessedto form two forks, each fork having a flattened body carrying drillingflanges at either edge of the body of the fork, combined with meansconnecting the fiat bodies of the forks and arranged to limit theexpansion of the two forks during-the reaming operation.

2. In a device of thecharacter described,

-a drill having its main body recessed to form WILLIAM M. WALKER.

Witnesses:

C. H. CONKLIN, W. W. AINSWORTH.

